A Blood Pressure Prediction Method Based on Fluid-Structure Interaction Considering Residual Stress and Aorta Hyperelasticity
10.16156/j.1004-7220.2025.01.006
- VernacularTitle:一种基于流固耦合并考虑主动脉残余应力与超弹性的血压预测方法
- Author:
Yuefan ZHANG
1
;
Baolei GUO
;
Cuiru SUN
;
Xiangchen DAI
;
Haofei LIU
Author Information
1. 天津大学机械工程学院,天津 300350
- Publication Type:Journal Article
- Keywords:
computational fluid dynamics(CFD);
fluid-structure interaction(FSI);
moving boundary;
residual stress;
compliance
- From:
Journal of Medical Biomechanics
2025;40(1):49-57
- CountryChina
- Language:Chinese
-
Abstract:
Objective With considerion of aortic wall hyperelasticity and residual stress,to propose a numerical simulation method for predicting aortic blood pressure based on vascular compliance.Methods The residual stress solution method based on the closing opening angle was used to realize the analytical solution for the pressure-radius relationship of the idealized double-layered aortic wall model.The vascular compliance was calculated,and the pressure-radius relationship was applied to the moving boundary representing the motion of the aortic wall for numerical simulation,to obtain the relationship between vascular compliance and pulse pressure.The effects of with or without residual stress,hyperelasticity or linear elasticity constitutive relationships,as well as different ages on vascular compliance and aortic blood pressure were compared.The function of the stent graft was incorporated,by considering the stented region as a rigid wall,and the effects of different stent numbers and stent positions on aortic blood pressure were simulated.Results Vascular compliance with residual stress was higher than that without residual stress;correspondingly,when residual stress was considered,aortic pulse pressure was slightly lower than that without residual stress.Compared to the linear elastic model,the hyperelastic model predicted a smaller aortic pulse pressure value.The vascular compliance for different age groups showed 40-49 year-old＞60-69 year-old＞70 year-old and above;correspondingly,the pulse pressure for different age groups showed 40-49 year-old＜60-69 year-old＜70 year-old and above.When a stent with 60 mm length was implanted in the aorta,as the number of stents increasing,the aortic pulse pressure continued to rise,indicating that the wider the range of stent implantation,the higher the pulse pressure.The closer the stent implantation site was to the heart,the higher the pulse pressure.Conclusions The proposed simulation method in this study can accurately predict blood pressure and evaluate aortic compliance,providing theoretical and technical support for stent design and surgical plan optimization.
